Wave energy capture system, method for determining parameters of wave energy capture system

Abstract

The present disclosure provides a wave energy capture system, a method and device for determining parameters of the wave energy capture system, a device, and a storage medium. The wave energy capture system includes: a pneumatic wave energy conversion device and a floating platform; the pneumatic wave energy conversion device is deployed upstream of the floating platform; the pneumatic wave energy conversion device is configured to capture wave energy and reduce the water surface fluctuation downstream; the floating platform is configured to reflect the transmitted wave passing through the pneumatic wave energy conversion device to the pneumatic wave energy conversion device and provide a support plane. The wave energy capture system provided in this embodiment can improve the wave energy capture width ratio and increase the stability of the floating platform.

Description

Technical Field

[0001] The present disclosure relates to the technical field of offshore power generation, and particularly to a wave energy capture system, a method and device for determining parameters of the wave energy capture system, equipment, and a storage medium. Background Art

[0002] The ocean has abundant sustainable clean energies such as light energy, wind energy, and wave energy. Offshore floating wind turbines and floating photovoltaics respectively convert offshore wind energy and solar energy into electrical energy.

[0003] As a support structure for offshore floating wind turbines and floating photovoltaics, improving their stability under waves is a necessary condition for the development of offshore floating wind turbines and floating photovoltaics from shallow water to deep water. For example, offshore floating wind turbines and floating photovoltaics respectively convert offshore wind energy and solar energy into electrical energy.

[0004] The pneumatic wave energy conversion device is considered to be one of the most efficient wave energy conversion devices at present. While capturing wave energy, it can effectively reduce the water surface fluctuations downstream, provide a relatively stable water surface environment for the floating platform, improve the stability of the floating platform, and reduce the adverse effects of harsh sea conditions on the floating platform. Summary of the Invention

[0005] The present disclosure provides a wave energy capture system, a method and device for determining parameters of the wave energy capture system, equipment, and a storage medium to solve the above technical problems.

[0006] According to a first aspect of the present disclosure, there is provided a wave energy capture system, including: a pneumatic wave energy conversion device and a floating platform; the pneumatic wave energy conversion device is deployed upstream of the floating platform;

[0007] The pneumatic wave energy conversion device is configured to capture wave energy and reduce water surface fluctuations downstream;

[0008] The floating platform is configured to reflect the transmitted wave passing through the pneumatic wave energy conversion device back to the pneumatic wave energy conversion device and provide a support plane.

[0009] Optionally, the pneumatic wave energy conversion device includes: a floating chamber, a flow channel, and an air turbine; the flow channel is fixed to the bottom surface and side surface of the floating chamber; the air turbine is disposed at an opening at a first end of the flow channel;

[0010] The first end of the flow channel is above the water surface, and the second end of the flow channel is below the water surface;

[0011] The air turbine is configured to convert the air kinetic energy in the flow channel into mechanical motion.

[0012] Optionally, the air turbine includes a Wilson air turbine or an impulse air turbine.

[0013] Optionally, the pneumatic wave energy conversion device further includes: a first mooring subsystem; the first mooring subsystem is installed at a first designated position of the pneumatic wave energy conversion device;

[0014] The first mooring subsystem is used to constrain the pneumatic wave energy conversion device within a first preset area.

[0015] Optionally, the floating platform includes a floating body and a second mooring subsystem; the second mooring subsystem is installed at a second designated position of the floating body;

[0016] The second mooring subsystem is used to constrain the floating body within a second preset area;

[0017] The floating body is used to reflect the transmitted wave passing through the pneumatic wave energy conversion device to the pneumatic wave energy conversion device and provide a support plane.

[0018] Optionally, the pneumatic wave energy conversion device and the floating platform move independently of each other.

[0019] According to a second aspect of the present disclosure, there is provided a method for determining parameters of a wave energy capture system, the method including:

[0020] Obtaining the wave excitation force coefficient and hydrodynamic coefficient of the system model of the wave energy capture system;

[0021] Obtaining the motion response and dynamic characteristics of the pneumatic wave energy conversion device of the wave energy capture system; obtaining the motion response and dynamic characteristics of the floating platform of the wave energy capture system;

[0022] Obtaining the wave energy capture performance of the pneumatic wave energy conversion device.

[0023] Optionally, the method further includes:

[0024] Obtaining multiple sets of wave energy capture performances of the pneumatic wave energy conversion device;

[0025] Determining the frequency domain curve of the wave energy capture performance of the pneumatic wave energy conversion device according to the multiple sets of wave energy capture performances.

[0026] Optionally, the method further includes:

[0027] Adjusting at least one target parameter of the wave energy capture system;

[0028] Obtaining the wave energy capture performance of the pneumatic wave energy conversion device.

[0029] According to a third aspect of the present disclosure, there is provided an apparatus for determining parameters of a wave energy capture system, the apparatus comprising:

[0030] A coefficient acquisition module for acquiring a wave excitation force coefficient and a hydrodynamic coefficient of a system model of the wave energy capture system;

[0031] A response characteristic acquisition module for acquiring the motion response and dynamic characteristics of the pneumatic wave energy conversion device of the wave energy capture system, and also for acquiring the motion response and dynamic characteristics of the floating platform of the wave energy capture system;

[0032] A performance acquisition module for acquiring the wave energy capture performance of the pneumatic wave energy conversion device.

[0033] Optionally, the apparatus further comprises:

[0034] A performance acquisition module for acquiring multiple sets of wave energy capture performances of the pneumatic wave energy conversion device;

[0035] A curve acquisition module for determining a frequency domain curve of the wave energy capture performance of the pneumatic wave energy conversion device according to the multiple sets of wave energy capture performances.

[0036] Optionally, the apparatus further comprises:

[0037] A parameter adjustment module for adjusting at least one target parameter of the wave energy capture system;

[0038] A performance acquisition module for acquiring the wave energy capture performance of the pneumatic wave energy conversion device.

[0039] According to a fourth aspect of the present disclosure, there is provided an electronic device, comprising:

[0040] A processor and a memory;

[0041] The memory is used for storing a computer program executable by the processor;

[0042] Wherein, the processor is used for executing the computer program in the memory to implement the method according to any one of the third aspects.

[0043] According to a fifth aspect of the present disclosure, there is provided a non-transitory computer-readable storage medium, which can implement the method according to any one of the third aspects when the executable computer program in the storage medium is executed by a processor.

[0044] The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects:

[0045] The wave energy capture system provided in this embodiment can capture wave energy by the cooperation of a pneumatic wave energy conversion device and a floating platform, reduce the downstream water surface fluctuation, and improve the stability of the floating platform; the floating platform can also reflect the waves to the pneumatic wave energy conversion device. In this way, compared with a single pneumatic wave energy conversion device, the wave energy capture system provided in this embodiment can increase the wave energy capture width ratio except for the wave periods between 3.3 s and 3.6 s and between 7.7 s and 7.9 s, and the maximum increase in the capture width ratio can reach 16.4%; the period range with a capture width ratio not less than 0.6 is broadened by 48%.

[0046] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. Brief Description of the Drawings

[0047] Figure 1 It is a schematic structural diagram of a wave energy capture system according to an embodiment of the present disclosure.

[0048] Figure 2 It is a schematic structural diagram of a pneumatic wave energy conversion device according to an embodiment of the present disclosure.

[0049] Figure 3 It is a schematic structural diagram of a floating platform according to an embodiment of the present disclosure.

[0050] Figure 4 It is a flowchart of a method for determining the parameters of a wave energy capture system according to an embodiment of the present disclosure.

[0051] Figure 5 It is a schematic diagram of the structural parameters of a wave energy capture system according to an embodiment of the present disclosure.

[0052] Figure 6 It is a flowchart of another method for determining the parameters of a wave energy capture system according to an embodiment of the present disclosure.

[0053] Figure 7 It is a flowchart of yet another method for determining the parameters of a wave energy capture system according to an embodiment of the present disclosure.

[0054] Figure 8 It is a comparison schematic diagram of the capture width ratio according to an embodiment of the present disclosure.

[0055] Figure 9 It is a schematic diagram of the increase ratio of the capture width ratio according to an embodiment of the present disclosure.

[0056] Figure 10 It is a comparison schematic diagram of the response amplitude of a pneumatic wave energy conversion device in the surge direction according to an embodiment of the present disclosure.

[0057] Figure 11 Schematic diagram for comparison of response amplitude of a pneumatic wave energy conversion device in the heaving direction according to an embodiment of the present disclosure.

[0058] Figure 12 Schematic diagram for comparison of response amplitude of a pneumatic wave energy conversion device in the pitching direction under waves according to an embodiment of the present disclosure.

[0059] Figure 13 Schematic diagram for reduction ratio of motion response of a wave energy capture system under waves according to an embodiment of the present disclosure.

[0060] Figure 14 Block diagram of a device for determining parameters of a wave energy capture system according to an embodiment of the present disclosure. Detailed implementation manners

[0061] Here, exemplary embodiments will be described in detail, and examples thereof are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present disclosure. On the contrary, they are merely examples of devices consistent with some aspects of the present disclosure as detailed in the appended claims.

[0062] To solve the above technical problems, embodiments of the present disclosure provide a wave energy capture system, a method and device for determining parameters of a wave energy capture system, a device, and a storage medium.

[0063] Figure 1 Schematic diagram of the structure of a wave energy capture system according to an embodiment of the present disclosure. Refer to Figure 1 , a wave energy capture system includes: a pneumatic wave energy conversion device 10 and a floating platform 20; the pneumatic wave energy conversion device 10 is deployed upstream of the floating platform 20.

[0064] The pneumatic wave energy conversion device 10 is configured to capture wave energy and reduce the water surface fluctuation downstream;

[0065] The floating platform 20 is configured to reflect the transmitted wave passing through the pneumatic wave energy conversion device 10 back to the pneumatic wave energy conversion device 10 and provide a support plane.

[0066] It should be noted that in this embodiment, the pneumatic wave energy conversion device 10 and the floating platform 20 can move independently of each other, so as to ensure the wave energy capture efficiency of the wave energy capture system.

[0067] In one embodiment, refer to Figure 2, the pneumatic wave energy conversion device 10 includes: a floating chamber 21, a flow channel 22, and an air turbine 23; the flow channel 22 is fixed on the floating chamber 21; the air turbine 23 is arranged at the opening of the first end of the flow channel 22;

[0068] The floating chamber 21 is used to provide buoyancy;

[0069] The first end 221 of the flow channel 22 is above the water surface, and the second end 222 of the flow channel 22 is below the water surface, and is used to convert wave energy into air kinetic energy;

[0070] The air turbine 23 is used to convert the air kinetic energy in the flow channel 22 into mechanical motion.

[0071] It should be noted that, continue to refer to Figure 2 , Figure 2 illustrates the positions of the first end 221 and the second end 222 of the flow channel 22 when the water surface is stationary. At this time, the water surface can be understood as a stationary horizontal plane. Considering the working environment in which the pneumatic wave energy conversion device 10 works, it can be understood that the first end 221 of the flow channel 22 being above the water surface means that the first end 221 is higher than the wave crest; the second end 222 of the flow channel 22 being below the water surface means that the second end 222 is lower than the wave trough.

[0072] It should be noted that the flow channel 22 can be implemented by flow channels of different shapes. In one example, the flow channel 22 is implemented by an L-shaped flow channel. This L-shaped flow channel can ensure that the liquid in the flow channel flows with the minimum resistance, avoid waste of wave energy, that is, improve the capture efficiency of wave energy.

[0073] In one example, the air turbine 23 can include a Wilson air turbine or an impulse air turbine. Of course, the air turbine 23 can also be implemented by other air turbines. In the case of being able to convert air kinetic energy into mechanical motion, the corresponding solutions fall within the protection scope of the present disclosure.

[0074] The working principle of the pneumatic wave energy conversion device 10 provided in this embodiment is:

[0075] When the upstream wave or the downstream reflected wave is captured by the pneumatic wave energy conversion device 10, the floating chamber 21 of the pneumatic wave energy conversion device 10 will swing following the wave (such as at least one of surge, heave, and pitch).

[0076] In one example, taking the intersection of the front side wall surface of the pneumatic wave energy conversion device 10 and the stationary water surface as the coordinate origin O, a Cartesian coordinate system xoz is established. Among them, the surge direction refers to the x-axis direction or the wave propagation direction, the heave direction refers to the z-axis direction or the vertically upward direction, and the pitch direction refers to the clockwise rotation direction around the Cartesian coordinate system xoz.

[0077] When the floating chamber 21 sways following the waves, the liquid (such as seawater) in the flow channel 22 will track the swaying, causing the density of the air between the liquid surface and the first end 221 of the flow channel 22 to change. Or rather, the air in the flow channel 22 will undergo periodic compression and expansion, thereby driving the air turbine 23 to rotate. When the air turbine 23 rotates, it can convert air kinetic energy into mechanical motion.

[0078] In one embodiment, referring to Figure 3 , the pneumatic wave energy conversion device 10 further includes: a first mooring subsystem 24; the first mooring subsystem 24 is installed at a first position of the pneumatic wave energy conversion device. Among them, the first designated position may include the bottom or side surface of the floating chamber 21. The first mooring subsystem 24 is used to constrain the pneumatic wave energy conversion device 10 within a first preset area; or rather, the first mooring subsystem 24 can position the pneumatic wave energy conversion device 10 to prevent the pneumatic wave energy conversion device 10 from moving out of the first preset area, or when the pneumatic wave energy conversion device 10 moves out of the first preset area, the first mooring subsystem 24 can adjust the tension of each cable to move the pneumatic wave energy conversion device 10 into the first preset area, or the first mooring subsystem 24 can move the pneumatic wave energy conversion device 10 into the updated first preset area when it detects that the first preset area has been updated. The above-mentioned first preset area is an area located upstream of the floating platform 20.

[0079] In one embodiment, continue to refer to Figure 3 , the floating platform 20 includes a floating body 31 and a second mooring subsystem 32. The second mooring subsystem 32 is installed at a second designated position of the floating body 31. Among them, the second designated position may include the bottom or side surface of the floating body 31.

[0080] The floating body 31 can be implemented by any floating body that can provide buoyancy, such as a box-shaped floating body, etc., and is used to provide a floating support plane for offshore wind turbines, photovoltaic power generation systems, offshore airports, etc.

[0081] The second mooring subsystem 32 is used to constrain the floating body 31 within a second preset area. Or rather, the second mooring subsystem 32 can position the floating body 31 and constrain the motion response of the floating body 31 within the second preset area, that is, prevent the floating body 31 from moving out of the second preset area, or when the floating body 31 moves out of the second preset area, the second mooring subsystem 32 can adjust the tension of each cable to move the floating body 31 into the second preset area, or the second mooring subsystem 32 can move the floating body 31 into the updated second preset area when it detects that the second preset area has been updated. The above-mentioned second preset area is an area located downstream of the first preset area.

[0082] The floating body 31 is also used to reflect the transmitted wave passing through the pneumatic wave energy conversion device 10 to the pneumatic wave energy conversion device 10, so that the pneumatic wave energy conversion device 10 captures the wave energy of the reflected wave.

[0083] The working principle of the wave energy capture system provided in this embodiment is as follows:

[0084] After the wave arrives at the pneumatic wave energy conversion device 10 from the upstream, the pneumatic wave energy conversion device 10 can capture the wave energy in the wave and convert the above wave energy, such as converting the air kinetic energy caused by the wave energy into mechanical motion, and the above mechanical motion can be further converted into electric energy, etc., to achieve the purpose of utilizing wave energy.

[0085] After the pneumatic wave energy conversion device 10 captures the wave energy, it will reduce the amplitude of the wave downstream, thereby reducing the water surface fluctuation downstream. It can be understood that the floating platform 20 is located downstream of the pneumatic wave energy conversion device 10. When the distance between the floating platform 20 and the pneumatic wave energy conversion device 10 is relatively close, the reduction of the water surface fluctuation downstream will reduce the floating of the floating platform 20, thereby improving the stability of the floating platform 20 and increasing the stability of equipment such as wind turbines on the supporting plane provided by the floating platform, and reducing the adverse impact of bad sea conditions on the floating platform 20.

[0086] When the distance between the pneumatic wave energy conversion device 10 and the floating platform 20 is relatively close, the wave will pass through the pneumatic wave energy conversion device 10 and reach the floating platform 20. For the convenience of description, the wave passing through the pneumatic wave energy conversion device 10 is called the transmitted wave. After the transmitted wave reaches the floating platform 20, the transmitted wave and the floating platform 20 will act on each other to form a reflected wave, and the moving direction of this reflected wave is from downstream to upstream. Since the distance between the pneumatic wave energy conversion device 10 and the floating platform 20 is relatively close, this reflected wave will be captured by the pneumatic wave energy conversion device 10, and the wave energy in the reflected wave will be captured.

[0087] According to the working principle of the wave energy capture system, a wave is captured once by the pneumatic wave energy conversion device 10 during the process from upstream to downstream; after encountering the floating platform 20 downstream, a reflected wave is formed, and this reflected wave will be captured again when it moves from downstream to upstream. That is to say, a wave can be captured twice by the pneumatic wave energy conversion device 10, improving the wave energy capture efficiency of the pneumatic wave energy conversion device 10.

[0088] Based on Figures 1 to 3 An example of a wave energy capture system, the present disclosure embodiment also provides a method for determining the parameters of the wave energy capture system, see Figure 4 , including step 41 to step 43.

[0089] In step 41, the wave excitation force coefficient and hydrodynamic coefficient of the system model of the wave energy capture system are obtained.

[0090] In this embodiment, the target parameters of the wave energy capture system can be configured, and the target parameters can include at least one of the following: the turbine coefficient, the length of the pneumatic wave energy conversion device (such as Figure 5 the distance l2 shown), the draft of the pneumatic wave energy conversion device (such as Figure 5 the distance d1 shown), the height of the L-shaped flow channel (d2 - d1), the length of the floating platform (l4 - l3), the draft of the floating platform (such as Figure 5 the distance d3 shown), the relative distance between the pneumatic wave energy conversion device and the floating platform (l3 - l2), the mass of the pneumatic wave energy conversion device, and the mass of the floating platform. It should be noted that the above target parameters can be referred to Figure 5 and will be explained in combination with the system model later, and will not be described here first.

[0091] It should be noted that the turbine coefficient is related to the air turbine, that is, changing the turbine coefficient can determine the required air turbine.

[0092] In this embodiment, after configuring the target parameters, the system model of the wave energy capture system can be obtained. The system model is a mathematical model in which the pneumatic wave energy conversion device 10 and the floating platform 20 are coupled, and the control equations of the mathematical model include: the water body motion equation, the mathematical model boundary conditions, the pneumatic wave energy capture device motion equation, the floating platform motion equation, and the pneumatic wave energy conversion device characteristic equation.

[0093] In an example, the water body motion equation is the Laplace equation, as shown in Equation (1).

[0094]

[0095] In Equation (1), φ represents the spatial velocity potential stripped of the time factor, which reflects the velocity distribution of the water body; represents the motion velocity of the water body in the x direction; represents the motion velocity of the water body in the z direction.

[0096] In an example, the mathematical model boundary conditions include the free surface boundary condition, as shown in Equation (2).

[0097]

[0098] In Equation (2), i represents the imaginary unit in the complex number; g represents the acceleration due to gravity; ω represents the wave frequency; ρ w represents the density of the water body; p represents the relative pressure amplitude of the first end of the flow channel of the pneumatic wave energy conversion device (i.e., the end above the water surface); such asFigure 5 As shown, H1 is the water-gas interface in the L-shaped flow channel, and H2 is the definition of the water-gas interface outside the L-shaped flow channel; x and z respectively represent the coordinates of each point in the water body in the x-direction and z-direction.

[0099] In one example, the boundary conditions of the mathematical model also include the bottom boundary condition, as shown in Equation (3).

[0100]

[0101] In one example, the boundary conditions of the mathematical model include the boundary conditions at infinity, as shown in Equations (4) and (5).

[0102]

[0103] ktanhkh = ω 2 / g. (5)

[0104] In Equations (4) and (5), k represents the wave number when the water depth is h when the water body is stationary. The wave number refers to the number of waves appearing in a length of 2π.

[0105] In one example, the boundary conditions of the mathematical model include the surface boundary conditions of the pneumatic wave energy conversion device and the floating platform, as shown in Equation (6).

[0106]

[0107] In Equation (6), U n represents the amplitude of the unit normal velocity of the surface of the pneumatic wave energy conversion device and the floating platform.

[0108] In this embodiment, the motion equation of the pneumatic wave energy conversion device, the motion equation of the floating platform, and the characteristic equation of the pneumatic wave energy conversion device form a matrix equation, as shown in Equation (7).

[0109] {-ω 2 ([M]+[A]) - iω[C]+[K s +[K P}{X} = {F}. (7)

[0110] In Equation (7), [M] represents the mass matrix of the pneumatic wave energy conversion device and the floating platform, [A] represents the added mass coefficient matrix, [C] represents the radiation damping coefficient matrix, [K s represents the hydrostatic restoring coefficient matrix, [K P represents the matrix related to the gas part, and {F} represents the wave excitation force column vector.

[0111] Among them, [M], [K s and [K PIt is determined by the structural parameters and material parameters of the selected pneumatic wave energy conversion device and the floating platform. [A], [C], and {F} are the parameters to be determined.

[0112] In this embodiment, the diffraction problem and radiation problem of the wave energy capture system can be solved based on the system model of the above wave energy capture system to obtain the wave excitation force coefficient and hydrodynamic coefficient.

[0113] Among them, the wave excitation force is used to represent the wave force received when both the pneumatic wave energy conversion device and the floating platform remain stationary under the action of waves and the relative pressure at the air end of the flow channel of the pneumatic wave energy conversion device is 0. The hydrodynamic coefficient is used to represent the influence of the surrounding water body on the pneumatic wave energy conversion device and the floating platform when the pneumatic wave energy conversion device and the floating platform are in motion and the relative pressure at the air end of the flow channel of the pneumatic wave energy conversion device changes.

[0114] In this embodiment, the hydrodynamic coefficient includes the added mass coefficient [A] and the radiation damping coefficient [C].

[0115] In one example, the diffraction problem of the system model of the above wave energy capture system can be solved, that is, the diffraction wave velocity potential of the pneumatic wave energy conversion device and the floating platform is solved to obtain the wave excitation force of the pneumatic wave energy conversion device and the floating platform. In this example, it can be assumed that U n = 0 and p = 0.

[0116] In another example, the radiation problem of the system model of the above wave energy capture system can be solved, that is, the radiation wave velocity potential of the pneumatic wave energy conversion device and the floating platform is solved to obtain the hydrodynamic coefficient of the pneumatic wave energy conversion device and the floating platform. In this example, it can be assumed that U x = 1 m / s, U z = 1 m / s, U xoz = 1 m / s or p = 1 Pa.

[0117] Among them, U x represents the velocity amplitude of the pneumatic wave energy conversion device and the floating platform in the surge direction, U z represents the velocity amplitude of the pneumatic wave energy conversion device and the floating platform in the heave direction, and U xoz represents the velocity amplitude of the pneumatic wave energy conversion device and the floating platform in the pitch direction.

[0118] In one example, continue to refer to Figure 5, the water body part where the wave energy capture system is located can be divided into seven regions, including: the region (I) before the cross-section formed by the front side of the pneumatic wave energy conversion device to the bottom of the water body, the region (II) formed by the bottom of the pneumatic wave energy conversion device and the bottom of the water body, the spatial region (III) formed by the first end of the flow channel to the bottom of the flow channel, the spatial region (IV) formed by the second end of the flow channel to the nearer vertical side wall of the flow channel, the spatial region (V) between the rear side of the pneumatic wave energy conversion device and the front side of the floating platform, the region (VI) formed by the bottom of the floating platform and the bottom of the water body, and the region (VII) after the cross-section formed by the rear side of the floating platform to the bottom of the water body.

[0119] Velocity potential functions are established for each region respectively, as shown in Equations (8) to (14).

[0120]

[0121]

[0122]

[0123]

[0124]

[0125]

[0126]

[0127] In Equations (8) to (14), and respectively represent the coefficients to be determined, τ = D, R respectively represent the diffraction problem and the radiation problem; I τ represents the incident wave related term; and ) respectively represent the inhomogeneous terms; respectively represent the eigenfunctions, respectively represent the eigenvalues.

[0128] In an example, the incident wave related term is as shown in Equation (15).

[0129]

[0130] In Equation (15), h represents the height of the water surface to the bottom of the water body when the water is at rest.

[0131] In an example, the inhomogeneous terms are respectively as shown in Equations (16) to (19).

[0132]

[0133]

[0134]

[0135]

[0136] In formulas (16) to (19), d2 represents the distance from the bottom of the flow channel to the water surface when the water body is stationary; d3 represents the height of the floating platform below the water surface when the water body is stationary; R0 represents the radiation problem when the relative pressure amplitude at the first end of the flow channel of the pneumatic wave energy conversion device is 1 Pa; R1, R2, and R3 respectively represent the radiation problems when the velocity amplitudes of the pneumatic wave energy conversion device in the surge direction, heave direction, and pitch direction are 1 m / s, and R4, R5, and R6 respectively represent the radiation problems when the velocity amplitudes of the floating platform in the surge direction, heave direction, and pitch direction are 1 m / s.

[0137] In one example, the eigenfunction is as shown in formula (20).

[0138]

[0139]

[0140] The eigenvalues are:

[0141] In formulas (20) to (22), d1 represents the height of the floating chamber below the water surface when the water body is stationary; k′ represents the wave number at a water depth of d2, and k′tanhk′d2 = ω 2 / g.

[0142] In this embodiment, the undetermined coefficients in the velocity potential function of each region are calculated by combining the conditions of equal horizontal velocity, equal pressure at the interface between each region and adjacent regions, and formula (6). and

[0143] Then, the wave exciting force of the pneumatic wave energy conversion device and the floating platform can be obtained by integrating the diffraction wave velocity potential on the surfaces of the pneumatic wave energy conversion device and the floating platform, as shown in formula (23).

[0144]

[0145] In one example, F 气动式波浪能转换装置 is as shown in formula (24).

[0146]

[0147] In Equation (24), l1 represents the length inside the flow channel; l2 represents the length of the pneumatic wave energy conversion device; d1 represents the draft of the floating body in the pneumatic wave energy conversion device; d2 represents the draft of the pneumatic wave energy conversion device.

[0148] In one example, F 浮式平台 As shown in Equation (25).

[0149]

[0150] In Equation (25), l3 represents the sum of the length of the pneumatic wave energy conversion device and the relative distance, and the relative distance refers to the distance between the length of the pneumatic wave energy conversion device and the floating platform; l4 represents the distance between the front side of the pneumatic wave energy conversion device and the rear side of the floating platform; d3 represents the draft of the floating platform.

[0151] In one example, the hydrodynamic coefficients between the pneumatic wave energy conversion device and the floating platform can be obtained by integrating the radiation wave velocity potential on the surfaces of the pneumatic wave energy conversion device and the floating platform. Among them, the hydrodynamic coefficients include the added mass coefficient and the radiation damping coefficient.

[0152] Among them, the added mass coefficient [A] = [{a0} {a1} {a2} {a3} {a4} {a5} {a6}].

[0153] The radiation damping coefficient [C] = [{c0} {c1} {c2} {c3} {c4} {c5} {c6}].

[0154] The hydrodynamic coefficients are as shown in Equation (26).

[0155]

[0156]

[0157] In Equation (26), j = 0, 1, 2, 3, 4, 5, 6.

[0158] In step 42, obtain the motion response and dynamic characteristics of the pneumatic wave energy conversion device of the wave energy capture system; obtain the motion response and dynamic characteristics of the floating platform of the wave energy capture system.

[0159] In this embodiment, the wave excitation force and hydrodynamic coefficients of the pneumatic wave energy conversion device and the floating platform can be substituted into the matrix equation composed of the motion equation of the pneumatic wave energy conversion device, the motion equation of the floating platform, and the characteristic equation of the pneumatic wave energy conversion device, namely Equation (7); then the above matrix equation is solved to obtain the motion response amplitude of the pneumatic wave energy conversion device, the motion response amplitude of the floating platform, the gas partial pressure in the L-shaped channel, and the gas flow rate through the air turbine under the action of waves with a frequency of ω.

[0160] It can be understood that the motion response of the floating platform is the response amplitude of the pneumatic wave energy conversion device in each motion direction. The gas partial pressure in the L-shaped channel and the gas flow rate through the air turbine are the dynamic characteristics of the floating platform.

[0161] In step 43, the wave energy capture performance of the pneumatic wave energy conversion device is obtained.

[0162] In this embodiment, the wave energy capture performance of the pneumatic wave energy conversion device can be obtained. Among them, the wave energy capture performance refers to the wave energy capture width ratio of the pneumatic wave energy conversion device, which is expressed as the ratio of the wave energy captured by the pneumatic wave energy conversion device to the energy of the incident wave with the same width.

[0163] In one example, the wave energy captured by the pneumatic wave energy conversion device is as shown in Equation (27).

[0164]

[0165] In Equation (27), μ represents the linear turbine coefficient, and its value is related to the air turbine; represents the density of the air in the air chamber without disturbance.

[0166] In one example, the wave energy capture width ratio of the pneumatic wave energy conversion device is as shown in Equation (28).

[0167]

[0168] In Equation (28), η represents the wave energy capture width ratio; ρ w represents the density of the water body; g represents the acceleration due to gravity; A w represents the wave amplitude; C g represents the incident wave group velocity,

[0169] In one example, the water surface height is as shown in Equation (29).

[0170]

[0171] So far, the solution of this embodiment can independently control the pneumatic wave energy conversion device and the floating platform, enabling the two to interact with each other. That is, the pneumatic wave energy conversion device captures wave energy and provides a stable wave environment for the floating platform to improve the stability of the floating platform. The floating platform can reflect the transmitted waves to the pneumatic wave energy conversion device to improve the capture efficiency of the pneumatic wave energy conversion device. Moreover, the method for determining the parameters of the wave energy capture system provided in this embodiment can obtain the wave energy capture performance of the pneumatic wave energy conversion device, which can improve the efficiency of designing the wave energy capture system.

[0172] Based on Figure 4 a method for determining the parameters of a wave energy capture system shown above, the present disclosure embodiment also provides another method for determining the parameters of a wave energy capture system, which further includes step 61 and step 62.

[0173] In step 61, obtain multiple sets of wave energy capture performances of the pneumatic wave energy conversion device.

[0174] In this embodiment, the wave frequency can be changed, and steps 41 to 43 can be repeated to obtain the wave energy capture performances of the pneumatic wave energy conversion device at various wave frequencies. Finally, multiple sets of wave energy capture performances of the pneumatic wave energy conversion device can be obtained.

[0175] In step 62, determine the frequency-domain curve of the wave energy capture performance of the pneumatic wave energy conversion device according to the multiple sets of wave energy capture performances.

[0176] In this embodiment, a coordinate system can be constructed based on the wave frequency and the wave energy capture performance, a frequency curve can be generated, and the frequency-domain curve of the wave energy capture performance of the pneumatic wave energy conversion device can be obtained.

[0177] So far, through obtaining the frequency-domain curve, the solution of this embodiment can select the configuration parameters of the wave energy capture system according to different wave frequencies, which can improve the design efficiency of the wave energy capture system.

[0178] Based on Figure 4 a method for determining the parameters of a wave energy capture system shown above, the present disclosure embodiment also provides another method for determining the parameters of a wave energy capture system. Refer to Figure 7 , which further includes step 71 and step 72.

[0179] In step 71, adjust at least one target parameter of the wave energy capture system.

[0180] In this embodiment, when the wave frequency is determined, at least one target parameter of the wave energy capture system can be adjusted. The target parameter can include at least one of the following: turbine coefficient, length of the pneumatic wave energy conversion device, draft depth of the pneumatic wave energy conversion device (such as the distance d1 shown in Figure 5 ), height of the L-shaped flow channel, length of the floating platform, draft depth of the floating platform (such as the distance d3 shown in Figure 5 ), relative distance between the pneumatic wave energy conversion device and the floating platform, mass of the pneumatic wave energy conversion device, and mass of the floating platform. It can be understood that changing each target parameter of the wave energy capture system is equivalent to redesigning a wave energy capture system, and its wave energy capture performance may change.

[0181] In step 72, the wave energy capture performance of the pneumatic wave energy conversion device is obtained.

[0182] In this embodiment, based on the adjusted target parameters, steps 41 to 43 are re-executed to obtain the wave energy capture performance of the pneumatic wave energy conversion device. In one example, the wave frequency can also be changed to obtain multiple sets of wave energy capture performances of the pneumatic wave energy conversion device; then, a frequency domain curve can be obtained according to the multiple sets of wave energy capture performances.

[0183] So far, in this embodiment, by adjusting at least one target parameter of the wave energy capture system, the structural parameters of the wave energy capture system can be optimized to improve the wave energy capture performance of the pneumatic wave energy conversion device and the stability of the floating platform, etc., thereby improving the design efficiency of the wave energy capture system.

[0184] Combined with Figure 5 the wave energy capture system and Figure 4 , Figure 6 and Figure 7 the method for determining the parameters of the wave energy capture system shown in the example for simulation verification, the simulation diagram shown in Figures 8 to 13 is obtained.

[0185] Figure 8 is a comparison schematic diagram of the capture width ratio of an embodiment of the present disclosure, Figure 9 is a schematic diagram of the improvement ratio of the capture width ratio of an embodiment of the present disclosure. Referring to Figure 8 and Figure 9 , compared with the single pneumatic wave energy conversion device (S1 is compared with S2), the wave energy capture system provided in this embodiment can increase the wave energy capture width ratio for wave periods other than 3.3 s to 3.6 s and 7.7 s to 7.9 s, and the capture width ratio is increased by up to 16.4% at wave periods of 3.8 s and 6.1 s; at the same time, the period range where the capture width ratio is not less than 0.6 is widened by 48%.

[0186] Figure 10 A schematic comparison diagram of the response amplitude of a pneumatic wave energy conversion device in the surge direction according to an embodiment of the present disclosure. Figure 13 A schematic diagram of the reduction ratio of the motion response of a wave energy capture system under waves according to an embodiment of the present disclosure. Refer to Figure 10 and Figure 13 , compared with the single floating platform (S1 compared with S3), the wave energy capture system provided in this embodiment can reduce the response amplitude of the floating platform in the surge direction at wave periods other than 5.5 s to 5.8 s, and can reduce the response amplitude of the floating platform in the surge direction at wave periods other than 5.3 s to 6.1 s and greater than 8.5 s by greater than or equal to 50%, and the response amplitude is reduced by up to 90% at a wave period of 4.1 s.

[0187] Figure 11 A schematic comparison diagram of the response amplitude of a pneumatic wave energy conversion device in the heave direction according to an embodiment of the present disclosure. Refer to Figure 11 and Figure 13 , compared with the single floating platform (S1 compared with S3), the wave energy capture system provided in this embodiment can reduce the response amplitude of the floating platform in the heave direction under waves at wave periods other than 5.5 s to 5.8 s; it can reduce the response amplitude of the floating platform in the heave direction under waves at wave periods other than 5.3 s to 6 s and greater than 8.1 s by greater than or equal to 50%, and the maximum reduction ratio is 86% at wave periods of 4.5 s and 7.5 s.

[0188] Figure 12 A schematic comparison diagram of the response amplitude of a pneumatic wave energy conversion device in the pitch direction under waves according to an embodiment of the present disclosure. Refer to Figure 12 and Figure 13 , compared with the single floating platform (S1 compared with S3), the wave energy capture system provided in this embodiment can reduce the response amplitude of the floating platform in the pitch direction under waves at wave periods other than 5.5 s to 5.8 s; it can reduce the response amplitude of the floating platform in the pitch direction under waves at wave periods other than 5.3 s to 6 s and greater than 8.3 s by greater than or equal to 50%; and, the response amplitude in the heave direction under waves is reduced by up to 86% at wave periods of 4.5 s and 7.5 s.

[0189] Based on the method for determining the parameters of a wave energy capture system provided in the embodiments of the present disclosure, the embodiments of the present disclosure further provide a device for determining the parameters of a wave energy capture system. Refer to Figure 14 , the device includes:

[0190] A coefficient acquisition module 141, configured to acquire a wave excitation force coefficient and a hydrodynamic coefficient of a system model of a wave energy capture system;

[0191] A response characteristic acquisition module 142, configured to acquire a motion response and dynamic characteristics of a pneumatic wave energy conversion device of the wave energy capture system, and further configured to acquire a motion response and dynamic characteristics of a floating platform of the wave energy capture system;

[0192] A performance acquisition module 143, configured to acquire the wave energy capture performance of the pneumatic wave energy conversion device.

[0193] In one embodiment, the device further includes:

[0194] A performance acquisition module, configured to acquire multiple groups of wave energy capture performances of the pneumatic wave energy conversion device;

[0195] A curve acquisition module, configured to determine a frequency domain curve of the wave energy capture performance of the pneumatic wave energy conversion device according to the multiple groups of wave energy capture performances.

[0196] In one embodiment, the device further includes:

[0197] A parameter adjustment module, configured to adjust at least one target parameter of the wave energy capture system;

[0198] A performance acquisition module, configured to acquire the wave energy capture performance of the pneumatic wave energy conversion device.

[0199] It should be noted that the device embodiment provided in this embodiment corresponds to the above method embodiment. Specifically, reference may be made to the content of the above method embodiments, which will not be elaborated here.

[0200] The embodiments of the present disclosure further provide an electronic device, including:

[0201] A processor and a memory;

[0202] The memory is used to store a computer program executable by the processor;

[0203] Wherein, the processor is configured to execute the computer program in the memory to implement the above method.

[0204] The embodiments of the present disclosure further provide a non-transitory computer-readable storage medium, when the executable computer program in the storage medium is executed by a processor, it can implement the above method.

[0205] In some possible embodiments, a non-transitory computer-readable storage medium is provided, when the executable computer program in the storage medium is executed by a processor, it can implement the above method.

[0206] Other embodiments of the present disclosure will be readily apparent to those skilled in the art upon consideration of the specification and practice of the disclosure herein. The present disclosure is intended to cover any variations, uses, or adaptations of the disclosure that follow the general principles of the disclosure and include known or customary techniques in the art not disclosed herein. The specification and examples are only to be considered as exemplary, and the true scope and spirit of the present disclosure are pointed out by the following claims.

[0207] It should be understood that the present disclosure is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is only limited by the appended claims.

Claims

1. A wave energy capture system, characterized in that, Comprising: A pneumatic wave energy conversion device and a floating platform; the pneumatic wave energy conversion device is deployed upstream of the floating platform; The pneumatic wave energy conversion device is used for capturing wave energy and reducing the water surface fluctuation downstream; The pneumatic wave energy conversion device includes: a floating chamber, an L-shaped flow channel, and an air turbine; The L-shaped flow channel is fixed on the bottom surface and side surface of the floating chamber; the air turbine is arranged at the opening of the first end of the L-shaped flow channel; the first end of the L-shaped flow channel is above the water surface, and the second end of the L-shaped flow channel is below the water surface and faces the floating platform; the air turbine is used for converting the air kinetic energy in the L-shaped flow channel into mechanical motion; The floating platform is used for reflecting the transmitted wave passing through the pneumatic wave energy conversion device to the pneumatic wave energy conversion device and providing a support plane.

2. The system according to claim 1, wherein The air turbine includes a Wilson air turbine or an impulse air turbine.

3. The system according to claim 1, characterized in that The pneumatic wave energy conversion device further includes: a first mooring subsystem; the first mooring subsystem is installed at a first designated position of the pneumatic wave energy conversion device; The first mooring subsystem is used for restricting the pneumatic wave energy conversion device within a first preset area.

4. The system according to claim 1, wherein The floating platform includes a floating body and a second mooring subsystem; the second mooring subsystem is installed at a second designated position of the floating body; The second mooring subsystem is used for restricting the floating body within a second preset area; The floating body is used for reflecting the transmitted wave passing through the pneumatic wave energy conversion device to the pneumatic wave energy conversion device and providing a support plane.

5. The system according to claim 1, characterized in that, The pneumatic wave energy conversion device and the floating platform move independently of each other.

6. A method for determining parameters of a wave energy capture system, characterized in that, Applicable to the wave energy capture system according to any one of claims 1 to 5, the method includes: Obtaining the wave excitation force coefficient and hydrodynamic coefficient of the system model of the wave energy capture system; Obtaining the motion response amplitude and dynamic characteristics of the pneumatic wave energy conversion device of the wave energy capture system; obtaining the motion response amplitude and dynamic characteristics of the floating platform of the wave energy capture system; Obtaining the wave energy capture performance of the pneumatic wave energy conversion device.

7. The method according to claim 6, characterized in that, The method further includes: Obtaining multiple groups of wave energy capture performances of the pneumatic wave energy conversion device; Determining the frequency domain curve of the wave energy capture performance of the pneumatic wave energy conversion device according to the multiple groups of wave energy capture performances.

8. The method according to claim 6, characterized in that, The method further includes: Adjusting at least one target parameter of the wave energy capture system; Obtaining the wave energy capture performance of the pneumatic wave energy conversion device.

9. An apparatus for determining parameters of a wave energy capture system, characterized in that, Applicable to the wave energy capture system according to any one of claims 1 to 5, the device includes: A coefficient acquisition module, configured to obtain the wave excitation force coefficient and hydrodynamic coefficient of the system model of the wave energy capture system; A response characteristic acquisition module, configured to obtain the motion response amplitude and dynamic characteristics of the pneumatic wave energy conversion device of the wave energy capture system, and is also configured to obtain the motion response amplitude and dynamic characteristics of the floating platform of the wave energy capture system; A performance acquisition module, configured to obtain the wave energy capture performance of the pneumatic wave energy conversion device.

10. The device according to claim 9, characterized in that, The device further includes: A performance acquisition module, configured to acquire multiple groups of wave energy capture performances of the pneumatic wave energy conversion device; A curve acquisition module, configured to determine a frequency-domain curve of the wave energy capture performance of the pneumatic wave energy conversion device according to the multiple groups of wave energy capture performances.

11. The device according to claim 10, characterized in that, The device further includes: A parameter adjustment module, configured to adjust at least one target parameter of the wave energy capture system; A performance acquisition module, configured to acquire the wave energy capture performance of the pneumatic wave energy conversion device.

12. An electronic device, characterized in that, It includes: A processor and a memory; The memory is used to store a computer program executable by the processor; Wherein, the processor is configured to execute the computer program in the memory to implement the method according to any one of claims 6 to 8.

13. A non-transitory computer-readable storage medium, characterized in that, When the executable computer program in the storage medium is executed by the processor, the method according to any one of claims 6 to 8 can be implemented.

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